diff --git a/dnf-plugins-core.spec b/dnf-plugins-core.spec
index 5bade18..5c2d103 100644
--- a/dnf-plugins-core.spec
+++ b/dnf-plugins-core.spec
@@ -96,6 +96,7 @@ mkdir build-py3
 %endif
 
 %build
+export LANG=en_US.UTF-8
 pushd build-py2
   %cmake ../
   %make_build